It seems like my tranny isn't going into o.d. As long as I am cruising until I let off throttle. What rpm should the engine be turning at 80 mph? Mine is at 4000 which seems high to me. Act like it is still in 3rd but can see a small change when I turn od off on shifter.

1988 Conquests

His: Durban maroon with 351w
Sophia white MS2 full sequential with BW S257sxe in the middle of a full tear down

It isn't difficult to reset the OD band, just jack up the car so you can get under and it's the cover plate with three bolts on it towards the front of the tranny. Follow the FSM method and see if that fixes it.

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Old thread, but just figured I would ad my .2 cents. At PF this passed weekend Larry helped me figure mine out there is a coolant sensor that switches to ground once the car has warmed up, check it. It is the 2 wire sensor when you apply ground to the lead for OD you can here the relay click on the trans, likely in the valve body.